Jack Dorsey is on a roll when it comes to the new tech start-up Square. Shares of fintech leader Square Inc. were trading Friday at a price of $13.63, representing an approximate 12% rise over the course of this year and reflecting a market cap of $4.8 billion.

Founded in 2009 by Jack Dorsey, who is also the founder and CEO of Twitter Inc. Square has transformed from simply a payments processing platform, to a one-stop shop for merchant clients from small businesses to large enterprises.

After a tumultuous first half of 2016, Square stock rallied 47% in the most recent six-month period, posting consecutive quarterly earnings that beat the Street’s estimates.

Jack Dorsey wants Twitter Inc.’s users to know he’s listening to them. His tweet Thursday soliciting product feedback from users drew hundreds of responses, highlighting concerns with everything from abuse on the site to users’ inability to fix errors after they publish tweets.

“We’ll consider everything we heard from you,” Dorsey said Friday on Twitter. “Not going to ship all of it, but will be more transparent about why and what we learned.”

Dorsey is taking more control over Twitter’s product after the company lost itschief operating officer andchief technology officer. Now, out of necessity, the product, engineering and design divisions report directly to him. The product division is run by an executive relatively new to Twitter, Keith Coleman, who joined with an acquisition on Dec. 1.

Twitter, which lets users post 140-character messages and follow the tweets of others, has had trouble defining its vision after years of executive turnover. The San Francisco-based company is under pressure to show it can expand its audience of about 317 million monthly active users, as advertising revenue starts to increase more slowly. Twitter failed to find an acquirer earlier this year and the social media company said in October it wouldeliminate 9 percent of its workforce. The shares lost 30 percent this year, closing Friday at $16.30.

But insiders at Twitter tell Highlight Hollywood, “We are ecstatic that Jack [Dorsey] will be taking a bigger role here at Twitter. If anyone can turn things around, Jack can.